Conformational transition of the lid helix covering the protease active site is essential for the ATP-dependent protease activity of FtsH

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• 作者：Ryoji Suno ; Masakazu Shimoyama ; Akiko Abe ; Tatsuro Shimamura ; Natsuka Shimodate ; Yo-hei Watanabe ; Yoshinori Akiyama ; Masasuke Yoshida
• 关键词：FtsH ; AAA+ ; ATP-dependent protease ; Protease ; ATPase
• 刊名：FEBS Letters
• 出版年：2012
• 出版时间：21 September, 2012
• 年：2012
• 卷：586
• 期：19
• 页码：3117-3121
• 全文大小：829 K

文摘

When bound to ADP, ATP-dependent protease FtsH subunits adopt either an ¡°open¡± or ¡°closed¡± conformation. In the open state, the protease catalytic site is located in a narrow space covered by a lid-like helix. This space disappears in the closed form because the lid helix bends at Gly448. Here, we replaced Gly448 with various residues that stabilize helices. Most mutants retained low ATPase activity and bound to the substrate protein, but lost protease activity. However, a mutant proline substitution lost both activities. Our study shows that the conformational transition of the lid helix is essential for the function of FtsH.

Structured summary of protein interactions

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